<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
</head>
<body>
	<script type="text/javascript">
		//第一步，得到用户输入的密码
		var password = prompt("请输入密码");

		//第二步，判断
		if(password == 123){
			alert("正确");
		}else{
			alert("错误");
		}
	</script>
</body>
</html>